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Showing content from https://en.cppreference.com/w/cpp/algorithm/../ranges/../../cpp/container/set/size.html below:

std::set<Key,Compare,Allocator>::size - cppreference.com

size_type size() const;

(noexcept since C++11)
(constexpr since C++26)

Returns the number of elements in the container.

[edit] Return value

std::distance(begin(), end())

[edit] Complexity

Constant.

[edit] Example

#include <cassert>
#include <set>
 
int main()
{
    std::set<int> nums{4, 2, 4, 2};
    assert(nums.size() == 2);
}

[edit] See also checks whether the container is empty
(public member function) [edit] returns the maximum possible number of elements
(public member function) [edit] returns the size of a container or array
(function template) [edit]

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